Hall Research UHBX-SW3-WP - Manual (Page 3)

Copyright 2015 Hall Research Pg 3
So when you connect a PC to the VGA port it will most likely select one of the 3 resolutions
specified in the detailed fields (1280x720 as the first choice), but will allow the user to select any of
the above resolutions via the display properties in Windows control panel.
The reason 1280x720 is designated as the “preferred” resolution is because it is a standard wide
screen format that all PC’s should be able to produce (the timing is standard VESA). 1920x1080
would have been a good choice also, but it is not listed standard VGA VESA timing and some PC
video cards may not be able to produce it.
HDMI EDID
The HDMI video input is normally not scaled by the SW3 and the video passes unaltered to the
display.
Both HDMI inputs follow the same EDID rules.
Since the video from the selected HDMI input gets to the TV untouched, it makes sense to pass the
EDID that is in the TV to the source, and let the source decide what resolution to output based on
the preferred (native) resolution of the actual TV (or one of its other supported formats).
As shipped from factory, the HDMI EDID is set to Pass-Through. This means that the SW3 will read
the EDID of the Actual TV connected and passes it to the sources connected. The user can select an
alternate EDID using the GUI via USB port. This internal “emulated” EDID is fixed.
The “Emulated” HDMI EDID lists resolutions with detailed timings per below:
First EDID Block (typically used by DVI sources)
Detailed Descriptor #1: 1280x720 @ 60Hz (marked as preferred)
Detailed Descriptor #2: 1280x800 @ 60Hz
Detailed Descriptor #3: 1680x1050 @ 60Hz
Detailed Descriptor #4: 1280x800 @ 60Hz
Second EDID Block (typically used by HDMI sources)
Detailed Descriptor #3: 1920x1080 @ 60Hz
Detailed Descriptor #3: 1920x1080 @ 50Hz
Detailed Descriptor #3: 1280x720 @ 60Hz
Detailed Descriptor #3: 1280x720 @ 50Hz